Carburetor



Patented Mar. 27, 1928.

saisis."

CHARLES EDWARD PALMER, OF MARSHFIELD, OREGON, ASSIGNOR T CHN OZIK,l 0F

MARSHFIELD, OREGON. v r

CARBUBETOR.

Application filed February 16, 1924, Serial No. 693,320. RenewedFebruary 15,1928.

gasoline, but the heavier fuels may be employed with equal advantage.

Another object of the invention is the provision of a carburetor inwhich the` primary air is supplied in cylindrical forma-V tion upon bothsides of an annular valve controlled fuel nozzle and secondary air isfurnished to the primary air and fuel at a point beyond and centrally ofthe said air andfuel supply. ,f f

A further object of the invention .is the provision of a deviceproviding. a divisional flow of primary air upon opposite sides of .afuel nozzle with a secondary air supply directed into the fuel andair'supply beyond the fuel supply, the secondary air supply be ingtapped from the primary air supply, and

the point of admission of the secondary air` supply to the primary airand fuel supplyi being advanced towards or away from the point ofinjection of the fuel into the primary air.

This invention will be best understood from'a consideration of thefollowing detailed description, in view of the accompany-l.

ing drawing forming a part of the specification; nevertheless it is tobe understood that the Vinvention is not 'conned to the disf closure,being susceptible of such changes.y

and modifica-tions which shall vdefine nomaterial departure from thesalient features of the invention as expressed inthe appended claims. iu

In vthe drawings:

Y Figure 1 is a vertical section of a carbu,- -Y

retor` ,constructed in accordance Vwith the principles of my` invention.f

yFigure 2 is a horizontal sectionk taken 'along the line 2-2 of Figure1.

Referring more particularly to the drawings, 1 designates a primary airconduit connected to a mixing chamber 2 by a body Y l while the mixingtubev is provided lwith a throttle valve 5. The mixing tube 1s pro- Theair con-v duit l is equipped withV a choke valve,v

vided with the usual perforated flange-8 for,

connection to 'theintakemanifold'of an enf gine. The mixing tube isreduced at itsupf `per end to form a restricted passage asshown at 7 uAn annular channel member 8 is mounted centrally of and spaced from theinner wall of the body member 3 therebyk providing a l l cylindricallprimary air passage 9 between the channel member and the body andthusconnecting the air conduit 1 with the mixing tube 3. The central sectionof the channel member being inollow likewise formsy aV pas- V;\

sage 10 between the air conduit and the kmixing tube. y l y The channel11y in the meinber8 provides an annular fuel chamber which is incomemunication with afloat chamber 12 by means Vof a conduity 13 formedin the integral connection 14 between the float chamber and the bodymember. The conduit 13 is con-gV tinued through therrib 15 whichsupports l the channel member 8 centrally'of thebody, member. Theconduit 13, aswell as a short conduit 16 leading to the float chamber12i from channel 13, open through a boss 11 at the bottom of the floatchamberto the atmos'fi phere and are closed by plugs 18. Byy the lremoval of the plugs the fuel chamber 1 1 and the'loat chamber may bedrainedof their contents for the. discharge of sediment.

The floatchamber is provided with a rea movable closure 19 which has acentral per-l foration forming" a' bearing for the guide stem 20connected with the float 21. A valve stem 22 secured tothe bottom ofthefloat carries a valve 231for controlling the flow of fuel through'afport 24C lconnecting thev kfuel supply pipe 25 with thefloat chamber.

The annularchannel member 8 is open vat its top, as vshown at 26,andprovided with aseat upon which-iis mounted an annular valve 27 havinga` Hared portion 28 and anv annulary depending flange 29, located withthe top of thefuel chamber `11 `for. equaliz-, ing the flow of gas fromthe chamber 8. The

flange is of .less widththan thechamber whereby fuel may be drawnlupwardly upon opposite sides o f the flange andvsprayed intoy theincoming air upon` opposite sidesl of the inner wall of said channel'member-thereby mary air currents` passing through and Y around thechannel member 8.

An auxiliary air conduit 30 is projected centrally, through the passagel0 of the channel member 8 and terminates in a valve seat 3l at a pointbeyond the upper end of the annular valve 27. Ribs 27a connect valve. 27with the conduit 30. The lower end of the conduit is threaded externallyandl screwed into an internally threaded boss 32 vformed on the bottomof the primary air conduit l. The lower end of the auxiliary air conduitwhere screwed into the boss is closedlbyhan integral formation 33,beyond which a hollow7 extension 34 projects through an` openingin thebottom of the primary air conduit. K

Ar` valve stem 35 is mounted in a bearing inthe integral formation 33and carries a valve36V at itsupper end adapted to normally rest -ontheseat 3l atthe upper'end ofthe auxiliary aircon-duit 30. The lowerendfofthe-stem passes through the hollow extensiony 34 and is embracedby a coil spring seated in the said hollowT extension. Thespringbears atone end upon the bottomof the recess in the extension and at its otherend against-nuts 37,- screwed on the lower threaded end of the stem. Theadjustment ofthe nuts varies the tension of the spring and-therebyvarying the control oft-heil opening of the valve 36.

Y Anwoperating arm 38 is secured to the projecti-ng end of the extension34 for rotating the conduit30 and thus lowering or elevating the valve27 relative to the vopening 26 and/thus regulating the fuelnozzle formedlythevalve 27 andthe top ofthe cham- AnA annular rib 39 formed on thebottom offthe primary airconduit 1 and surrounding the'projecting end'ofthe conduit 3() is provided with teethadapte'd to be engaged by aspringpressed pawl 40 for maintaining*-the'vertical.adjustment of thetube 30.

Y The pawl is mounted in a barrel 4l formed passingvthrough the innerchannel 10 ofthe member 8. The pressure at 43 due to the venturis atthis point increases the velocity of the` air passing through saidchannels. Thefuel issuing Afrom the annular nozzle at of air and fuelwhich is .directed inwardlyw by the bowed inward portion'71 of themixing tube 2;

Vhenthe negative pressurein the mixing tube is sufficient by reasonYoffthe increased'l opening of the throttle valve 5 andthe in-y creasedspeed of the enginel to which`r the carburetor has been att-ached, thevalve-36-` opens against.A theftension'ofthe spring-at*Y the bottom ofythe 'valvestem' 35 and! supplies theV mixing chamberV with* addition-alair beyond the valve 27. Bylowering'the-` tube 30 through therotationoffthe--lever 38 the supply of fuel is decreased whileelevatingthe tube byI a reverse operation;l of thelever increases thesupply of fuel.

An adjustment of theI upper end fof the tube 30 4may be madewhichfwillbe-practicalfor lgeneral purposes.

An operating rod may Vbe-con-nected to the` lever 38 and directed to thedash-of al1-auto: mobile if desiredrfor adjustingthe -fuellas theoccasion may require. By regulating thenuts 37 theflow of auxiliaryairfromtheL conduit 30 is controlled..v

While the engine is running Ynormally'-theV auxiliary air valve isclosedlbuton opening up `the throttle more -air isv induced through--themain body of the carburetor,` some-off which passes through the slots42 vand causes?- the valve 36 'to rise `against the compressione of thespring at thevbottom of lthev valveV stem'.- y

Whatl` claimis: l. lnacarburetoryabody member,- an fan-- nular channelmember vforming a vfuel cham ber within the body member and spaced-Vfrom said body member to form anf-air-paitsn sage, the central portionofthe channel member being-'hollow providingfa centralair-l passage, theupper-end of thenchannel-memberbeing' opento provide a-valve seat, anannular valve mounted'on the seat and con trolling the iow offuel fromthe chamber,

a primary air conduit connected to the body member below the' channelmember,l means on the valve for causingy the fuel to be forced- Y inopposite directions-intothe. centraljair passage and into thepassagebetween' the channel member and-the body of the carburetor, an.auxiliaryl air'conduit projectingv through the channel member'andVspaced, from the inner walls of said membeig the upper end vof theauxiliary conduit being open and provided with a valve seat, a springpressed valve mounted on said last mentioned seat, the lower portion ofthe auxiliary conduit below the channel member being provided with aslot to admit air from the primary air conduit to the auxiliary airconduit, and a source of fuel in communication with the channel member.

2. In a Carburetor, a primary air intake tube, a mixing tube, a bodymember con necting the intake tube to the mixing tube, 'an auxiliary airtube located in the body member and having a valve controlled outletlprojected into the mixing tube Vand a vslotted portion located in theintake tube for receiving airv from the -intake tube, a hollowinternally threaded boss mounted in the inv take tube, the lower end ofthe auxiliary air tube Vbeing threaded into the hollow boss andprojecting externally of the intake tube, av

v lever connected with the projecting end of the auxiliary air tube forrotating said auxiliary air tube and likewise elevating or `lowering thevalved end of the auxiliary air tube relative to the mixing tube.

3. In a carburetor, a body member, an annular channel member forming aring shaped fuel chamber centrally disposed within the body member andproviding a central and outer passage for air, the upper end of thechannel being open, an annular fuel valve mounted on the upper open endof said chamber and having an annular liange Y depending into the openend of the chamber, a secondary air tube passing through the channelmemberrand adapted to supply air at a point which is above the open endof the chamber, said fuel valve being carried by the tube, and movablewith the tube forv fuel chamber providing a central air pas sage andspaced from the body member to form an outer air passage, an auxiliaryair tube mountedin the central airl passage" of the fuel chamber, avalve for controlling the flow of auxiliary air to the combustiblemixture, the auxiliary air tube being extended into the primary airintake land provided with a slot lfor the admission of air to theauxiliary air tube from the primary air intake, a valve for controllingthe open end of the fuel chamber and connected to the auxiliary airtube, means for moving the auxiliary air tube longitudinally of thebody' member wherebyy the last mentioned valve will be moved toward oraway froml the open end of the fuel chamber. i

CHARLES EDWARD PALMER.

